Hi DrSir,
I'm 29 years male. 68kgs. I found that small lump of 5mm diameter (since 5 months) and blackish exactly middle of backbone (backside).

size and color is not changing. its not paining also.

I consulted my family physician. They told that, this is cyst and will need surgery to remove.
so until it doesn;t give any problem (like pus or pain), I can ignore that..

somehow, they said no medicines needed in this case.. hence thought of checking..